Rotary kiln.



No. 528,555. PATENTEDAUG-14, 1905.

P. o. KROTTNAURER.

ROTARY KILN.

APPLIGATION PILEKD DEG. 25. 1904.

a @MZ @Nl/TED STATES PATET OFFICE- lrAULO. liliO'lNAURE-R, OF Cl{lCAGO,'ILLINOIS.

' ROTARY KILN. i.

andl artaking a spiral or screw form a apted by vt e rotary motion of the kiln to 'convey the clinker, the product of the kiln, rearward or in the direction of feed-supply and delivered at a higher elevation than the present form of kiln deliveries, and l also through said channels introdueecoldffair which, advancing over the moving elinker in the o posite direction-,cools it, and as the air reaclies the combustion portion of the kiln is superheated, readily unites with fuel-gases and intensifies the heat, increasing the ellicienc'y of the fuel.

To accomplish this, I close the-head of thel combustion'end of the kiln and introduce a fuel-supply pipe through the head of the kiln and provide a means for delivering the fuel into the kiln. v

My device is illustrated in the accompanying dra-wingain whichy Figure l is a longitudinal section of my iinproved rotary kiln. Fig. 2 is a cross-section on lineCd,Fig. 1. FigJ is a cross-section on line A l), Fig. l.

' In the eamstructimi of my iniproved kiln l use sul'istantially the presenti lorni of kiln now well known in the lndustry and insertja renioval'ile head '14 in the combustion end` 'liirough the head ll a fuel-supply pipe l5 is introducml, in which is a conveyor to carry i into the kiln the fuel-supply and limiting as much as possible the inllow of cold .air with the fuel.

Surrounding the combustion end of 'the kiln and mounted thereon is a lseries of; chan nels'el of spiral forni lying parallel ywith each other and with aline longitudinally through the' center of the kiln. lt will be noted that in the'eross-sectimi Fig. L l show eight of these channels 4.. Whether there are more or less is a inatterof discretionor ol' expediency. The channels 4 are )rovided with an inlet 3, communicating with the combustion end of the' kiln 2, into which the clinker or product of the kiln discharged. The-rotary motion v Specification of Letters Patent. Application filed December 23, i904. Serial No. 238.1115.

Patented Ang. 141906.

ol*1V the kiln will move the clinker in a direction dlrectly opposite to which it took in moving toward the combustion-chamber and delivers it into a drum 5, located at apoint be tween the combustion end and feed end of the I kiln 2, into which the channels 4 discharge.`

This drinn has the kiln 2 as' its axis and is provided with an inner and an outer chamber. The clinker is discharged into tlie'inner chamber, and thence.v is l'et into the outer chamber 6 through the outlet lend'froin which it passesv outward through the door 7 into the hopper 9. channels 4 and moving with the drumis an air-chamber 10, provided with an inlet 1l latter leads into the inner chamber of the drum 5. The movement of the cold air may be accelerated by a motor-driven fan in the air-chamber, the air forced .into the inner chamber ofthe drum` 5, and thence over the advancing clinker to the combustion-chamber throughthe channels 4. The passage of. the cold air over .the oalcined material has the twofold effect of first cooling the calcined `matter on its way to the drum `5 and oi heatacting valve 8,' which closes when the druml discharges to prevent the escape of the conlined air. l V

It is evident that my invention can be re-.idil y applied to any rotary kiln in service, as well as ln the construction of new kilns. y

llaving thus described my invention, what l claiin is new, and desire to protect by Let-` ters Patent, isM

l. A rotary kiln, a spirally-forined cha nel n'iountcd on said kiln parallel with'a line longitudinally through the center ol' said kiln; a means of com:nunication from the combustion end of said kiln to said channel, said channel adapted by the rotary motion of said kiln to convey the product of said kiln from the' conibustii)1i-chamber rearward and discharge it. 1

2. A rotary kiln, a series of spirally-iormed channels mounted on said kilnand having a means of communication'with the combustion-chamber of said kiln and adapted to inove the produc-tof said kiln toward the source oi' supply and discharge it.

A rotary kiln, a series of spirally-forrned Mounted exterior of the rand at the opposite end an outlet l2. The

Y lof 1o between said drum and the head of said kiln channels extending from said drum to the,

head ofsaidkiln.; ameans of communication.

through said channels, ca id channels adapted to take the product from the head of said kiln and deliver it' to said drum and a means of discharge from said drum.-

5. A rotary kiln, a series of spirally-formed l channels surmounting said kiln larallel with its axis, a drnm mounted on said 'ln of which said kiln'is its axis, communication between said drum and the head of said kiln by means of said channels; el meansfor driving air from said drum and through ,said channel to the head of said kiln, andmeans for rotating said kiln.

6.- rotary kiln, a-series of conveyers surmounting said rotary kiln, inlets to said conveyers from the combustion-chamber of said kiln and outlets for the same, a means for introducing cold air into the discharge-orifices of said conveyers and adapted to deliver said air at a high temperaturelinto he combustion-chamber of said kiln substantially as.

specified.

7. A rotary kiln, a closed hea-dior said kiln a series of channel conveyers surmounting said kiln, a feedwpcning for said channel conveyers from the head of said kiln, a dischargeoutlet for said channel conveyers, a drum having said rotary kiln as its axis to serve as the terminal of said channel conveyers, and a means for discharging from said drum, a means for introducing a cold-air supply into said drum and channel conveyers substantially as specified.

In testimon'f) whereof I afl'ix my ,signature in presence otwo witnesses,-

PAUL O. KROTTNAURER. Witnesses:

CHAS. SILVERMA'N, H. C. HUNSBERGER 

